Ring ridge reamer



Feb. 16, 1954 A. c. TOSKE 2,669,134

RING RIDGE REAMER Filed March 9, 1950 2 Sheets-Sheet l INVENTOR I I I BY I I I A ATTORNEY$.

Feb.-l6, 1954 A. c. TOSKE RING RIDGE REAMER 2 Sheets-Sheet 2 Filed March 9, 1950 INVENTOR ATTORNEYS.

Patented Feb. 16, 1954 UNITED S TAT ES PATENT G-F-FIQE- RINGRIDGE REAMER.

Arthur CIITc'iske, Jacksonville, Flat Application Mdrch 'il, 1950, Serial No'r1485568? This invention relates to: a; ring ridge .reamer.

In'the-art' of internal combustiont'engine maintenance and repair; it-is a,-:well known fact that piston rings wear a. cylinder to a. greaterextent than thepiston itself wears; the. cylinder, and since the ring travel'term-inates short" of the upper end of the cylinder, a ring zridge or annular'shoulder isformedmpon the cylinder-wall at theupper end of the-cylinder;

Before: the installation' ofinews piston rings, it is necessarythatthe ring ridge beremoved, and the present invention has for its maini ob ject the provision of Ialhand-operated tool which will accomplish removal of said ring ridge speedily'and with case, so asitormakethediameter"of the cylinder opening uniform" throughout the length of said cylinder. Another important object is to: provide a tool of the type stated which will, after removing the ring ridge, chamfer or bevelthe sharp edge at the extreme top of theicylinderffor thepurvpose of safer and easier installation of the: new rings:

Still another object: is to providers. tool as described which will be capable of mounting directly in the piston which: has just-beenremoved from the cylinder, said piston being inserted in the cylinder in inverted position with the tool mounted inside it, after which the tool and piston is readily rotatable for the purpose of scraping away the ring ridge,-

Still another object is to provide a toolasdescribed readily adjustable-to fit cylinders'aof different diameters.

Another'important object is to"provide;a tool of the type'stated which can-'be'manufactured atlowrcost-but which will be :quite durablepembodying a minimum of parts simply arranged.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combination of parts, hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings Fig. l is a top plan view of the tool mounted within a piston, a wrench inserted in the tool for rotating the same being shown in section.

Fig. 2 is a side elevational view of the tool, a piston in which the tool is mounted and a cylinder in which a ring ridge is to be reamed out being shown in vertical section.

Fig. 3 is a section-taken substantially on line 3--3:of Fig. 1.

Fig. 4 is a section. taken substantially on line 4-'-4-of- Fig.3;-

Fig; 5 isa section taken substantially on line 55 Of'Flg; 3.

Fig; 6 is a section taken substantiallyon line 6--6 of Fig. 3, portions -rbeing -brokenaway;

Referring to the drawingsinudetail, there has been illustrated in theadrawing j aeportion. of a cylinder wall I merging: at its upper end: into the uppersurface 2 of-.the cylinder block; The ring ridge 3. to be removed, said-Fridge having been formed by piston ring; wear, appears. atv the upper 1 end -of the cylinder wall as readilyseen in Figsl Z and3.

To accomplish removal of the-ring ridge -3, I provide amanually operated tool including the cylindrical body4-one end of which is threaded as at 5, the body 4 being formed intermediate its ends with atransverseopening 6 and, adjacent and. crosswise of said. opening, another transverse opening 1.

Either of i these openings-is adapted, to receive a crosspin 8- one endof which proiectsifrom .the body. 4 so as toengage, for, rotationlwith the body, a hand-operated adjusting;- wheel 9- having the central .openingrtopermitthe wheel to be removably slippedover the body 4, there -being. formed radially .of said. opening a pin-receiving' recess.l0,iin which thepin Bengages so that one using the tool can rotate the bodyA-byrotation of the adjusting. wheelil, to make necessaryadjustments in amanner to be described, in detail hereinafter.

The threaded end 5tofthelbody 4- islthreadably engaged in the threaded socket I I ofabit holder 12 the outer end of which is formed with the stop shoulder [3 that seats against the upper surface 2 when the tool is in use. The stop shoulder 13 is curved longitudinally as best seen from Figs. 1 and 2, in approximate correspondence with the curvature of the cylinder opening.

Accordingly, rotatable adjustment of the body 4 will shift the bit holder l2 radially of the cylinder opening, the bit holder l2 being kept against rotation by engagement of the stop shoulder I3 with the upper surface 2 of the cylinder block.

Formed in the outer surface of the bit holder I2 is a vertically disposed bit-receiving recess 14 in which is removably mounted a bit or cutter I5, the upper end of which can be enlarged as best seen in Fig. 3 so as to permit the cutting edge of said bit to curve outwardly at its upper end as best seen at It in Fig. 3, to bevel or chamfer the sharp extreme top edge of the cylinder opening after the ring ridge 3 has been removed by said bit.

In the opposite end of the body 4 I form an end recess I! which in the present instance is smooth-walled, for insertion of a dowel l8 the other end of which is removably positioned in an extension sleeve i9 inserted in the smoothwalled socket 20 formed in a bit holder 2|. The extension sleeve l9 can be one of a set of such sleeves varying in length, so as to swiftly adapt the tool for reaming ring ridges on cylinders of any diameter, fine adjustments being made by means of the hand wheel 9.

The bit holder 2| is, in general, shaped like the bit holder [2, being different therefrom only in that it has a smooth-walled socket as distinguished from the bit holder 12, the body receiving socket of which is threaded.

Formed upon the outer end of the bit holder 2| is the arcuate stop shoulder 22 seated upon the top surface 2 of the cylinder block, at a location diametrically opposite from the engagement of said surface 2 by the other stop shoulder l3.

Below the stop shoulder 22, the bit holder 2| is formed with a bit-receiving recess 23 in which is positioned the bit 24 formed like the bit I5.

Adapted to be removably slipped over the medial portion of the body 4 is the upstanding stem 25 having the body-receiving opening 26 formed in its lower end. Stem 25 in the present instance has an enlarged head 2"? at its upper end, which head is formed with a wrench-receiving, noncircular socket 28 in which can be inserted the working end 29 of a conventional wrench.

Of course, instead of a female wrench connection 22, a wrench-receiving male member can be formed upon the head 21, this being believed sufficiently obvious as not to require special illustration.

From the description which has been so far provided, it will be apparent that the entire tool is capable of complete disassembly, for insertion of the pin 8 at different locations lengthwise of the body t, and for insertion of any extension sleeves or wrench stems 25 found most desirable for the particular job.

In any event, the tool is assembled directly within the piston 30 just removed from the cylinder l, the bit holders being mounted directly within the conventional piston pin bosses 3! of said piston.

After the tool has been so mounted with the piston 30 inverted, the inverted piston, which will now constitute a hollow, cup-shaped boring head, is re-inserted in the cylinder opening, as shown in Fig. 2.

Necessary adjustments are now made by means of the wheel 9, so as to engage the cutters against diametrically opposite portions of the ring ridge, and by means of an ordinary wrench, the entire piston and tool mounted within said piston is rotated within the cylinder opening, so as to cut away said ring ridge. As the cutting operation continues, further adjustments are made as necessary by means of the hand wheel 9.

After the ring ridge 3 has been scraped fully away, thus to make the diameter of the cylinder opening uniform throughout, it will be found that the bits will have formed a beveled or chamfered top edge upon the cylinder opening, for safer and easier installation of the new piston rings.

What is claimed is:

A tool for reaming a cylinder bore to remove from the wall thereof an annular ridge resulting from the wear of piston rings against the wall of said bore, said tool comprising an openended elongated hollow head of a diameter substantially equal to the diameter of the cylinder bore, said head having horizontal openings extending transversely therethrough intermediate the ends thereof, tool bit holders mounted in the openings for movement therein along an axis which lies perpendicular to the longitudinal axis of the head, one of said tool bit holders having a threaded socket, tool bits mounted in the holders adjacent the periphery of the head for movement with said holders including a cylindrical body having one of its ends threaded in said hollow socket, the opposite end of said cylindrical body being rotatably mounted in the other tool bit holder, an adjusting Wheel secured to said cylindrical body and accessible through said open end of said hollow head for eifecting rotation of said cylindrical body, advancing or retracting said tool bits radially with relation to the head, as said adjusting wheel is rotated, and means carried by the tool bit advancing and retracting means and extending through one end of the head, for rotating said head about its longitudinal axis and moving the tool bits in contact with said ridge.

. ARTHUR C. TOSKE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,548,505 Boatman Aug. 4, 1925 1,635,103 Vlelsby July 5, 1927 2,046,241 Beard June 30, 1936 2,223,041 Maxwell Nov. 26, 1940 2,422,279 Zimmer June 17, 1947 

